# HSI vs AvMath

The clearest difference is update cadence: AvMath at daily against HSI's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. HSI sells 1 one-off in-app purchase and AvMath sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

HSI ships an update every 2 months, AvMath daily. The most recent releases landed on July 27, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | HSI | AvMath |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/hsi-instrument-approach-sim/id1278956934/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 2 MB |
| Requires iOS | 16.4 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NATHAN STANKEVICIUS](https://appshunter.io/developer/923933206) | [Elemental Services Pty Ltd](https://appshunter.io/developer/1706312049) |

## What reviewers say

### HSI

[App page](https://appshunter.io/ios/app/hsi-instrument-approach-sim/id1278956934)

Practice instrument approaches with realistic HSI displays and customizable navigation modes. Import your own approach plates to fly procedures as published. This app is designed for student pilots, instrument-rated pilots, and flight instructors.

**Highlights:** Import custom PDF approach plates, Realistic HSI instrument display, Multiple navigation modes (VOR, TACAN, LOC, NDB), Fix to Fix (Point to Point) training, Adjustable speed control for practice, Privacy-focused with zero data collection

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Upgrade | $9.99 | one-time |


### AvMath

[App page](https://appshunter.io/ios/app/avmath/id6464602048)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Version | $4.99 | one-time |


## Frequently asked questions

### Is HSI free?

HSI is free to download, with in-app purchases available.

### Is AvMath free?

AvMath is free to download, with in-app purchases available.

### Do HSI or AvMath have ads?

Neither HSI nor AvMath shows ads.

### Which is updated more often, HSI or AvMath?

HSI ships an update every 2 months, and AvMath daily. Most recently, HSI was updated on July 27, 2026 and AvMath on June 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*